2207 GIBSON PL 2022-10-28 - Laserfiche WebLink

• 11/18/2021 4! Hodgeengineeringinc. RE: 2207 Gibson Place Everett, WA Langus 3-Car Garage Plan Review 1 Engineering Response 7. See Sheet S3. It appears that the minimum required brace length is not met for the braced wall line with the double portal frame, Grid Line B-1. See Table R602.10.3(1) for minimum total length of braced wall panels based on a wind speed of 110 mph. A minimum required braced wall length for a 1 story structure with a braced wall method of CS-PF equals 4.5 feet. After applying the wind adjustment factors in Table R602.10.3(2), the provided brace wall length appears to be not the requirement. IRC Table R602.10.3(1) is a prescriptive engineering table as is chapter 6. We have engineered the structure to the 2018 IBC using a lateral loads modeling program developed for the American Wood Council. The 2017 pounds lateral force of shear line B is resisted by two 10' tall portal frames. The APA portal frame engineered capacities are in Table 1 of the APA Technical Topic TT-100H report dated May 2020. Conforms to International Building Code-IBC 2018 ASCE 7 Design Load.Standard-ASCE 7 2016 AWC Special Design Provisions for Wind and Seismic-SDPWS 2015 Image Clip from the Lateral Modeling Program A Portal Frame with Hold Downs for Engineered Applications TABLE 1 RECOMMENDED ALLOWABLE DESIGN VALUES FOR A SINGLE LEG OF AN APA PORTAL FRAME USED ON A RIGID-BASE FOUNDATION FOR WIND OR SEISMIC LOADING°,b,c,t Allowable Design(ASD)Values Minimum Portal Maximum Portal per Frame Segment Width(in.) Height(ft) Shear (lbf) Deflection(in.) Load Factor 16 8 850 0.33 3.09 • 10 625 0.44 2.97 24 8 1,675 0.38 2.88 10 1,125 0.51 3.42 a.Design values are based on the use of Douglas-fir or Southern pine framing.For other species of framing,multiply the above shear design value by the specific gravity adjustment factor=(1—(0.5—SG)),where SG=specific gravity of the actual framing.This adjustment shall not be greater than 1.0. b. For construction as shown in Figure 1, c. Values are for a single portal-frame segment(one vertical leg and a portion of the header).For multiple portal-frame segments,the allowable shear design values are permitted to'be multiplied by the number of frame segments. d. Interpolation of design values for heights between 8 and 10 feet,and for portal widths between 16 and 24 inches,is permitted. e.The allowable shear design value is permitted to be multiplied by a factor of 1.4 for wind design. f. If story drift is not a design consideration,the tabulated design shoal.values are permitted to be multiplied by a factor of 1.15. This factor is permitted to be used cumulatively with the wind-design adjustment factor in Footnote(e)above. 'fable 1 of APA TT-100H Hodge Engineering,Inc. John E. Hodge P.E. 3733 Rosedale St NW,Suite 200,Gig Harbor,WA 98335 - (253)857-7055